Free Credit Card Interest Calculator
Calculate how much a credit card balance really costs when making only minimum payments — total interest and payoff timeline. Free. No signup required.
- Principal$6,000.00 · 36%
- Total Interest$10,886.92 · 64%
For every dollar borrowed, you pay back $2.81 — interest adds 181% on top.
- Total Interest Paid$10,886.92
This is why credit card issuers are required to show a 'minimum payment warning' on statements — it usually costs far more than a fixed payoff plan.
About the Free Credit Card Interest Calculator
A minimum payment feels responsible — you're paying something every month, the balance isn't growing out of control, the statement doesn't flag anything urgent. But because the minimum is usually calculated as a small percentage of whatever the current balance happens to be, it shrinks right along with the balance, which stretches payoff out for years and lets interest compound against you the entire time.
This calculator simulates paying only the minimum, month by month, until the balance actually reaches zero, so you see the real payoff timeline and total interest cost — not a rough estimate, but the same kind of month-by-month math your card issuer runs internally.
It's aimed at anyone carrying a revolving balance who wants to know what 'just paying the minimum' is actually costing them before deciding whether to commit to a faster, fixed payoff plan instead.
Your balance and rate never leave your browser — credit card debt is not something anyone wants tied to their identity on a server they don't control.
How it’s calculated
Each month, interest is charged on the current balance at the card's APR divided by 12. The minimum payment is then calculated as a percentage of that balance (with a dollar floor, since issuers won't let the minimum drop below a set amount) — that payment covers the new interest first, and whatever's left over chips away at principal.
Because the payment is recalculated as a shrinking percentage of a shrinking balance, the dollar amount you pay drops over time too — which is exactly why minimum-only payoff drags on so long: the payment gets smaller precisely as the balance needs it to stay the same or grow to make real progress.
Frequently asked questions
Why does paying only the minimum take so long to pay off a balance?
Because the minimum payment shrinks along with the balance, less and less real progress gets made against principal each month, even as interest keeps accruing on whatever's left — it's a payment schedule that decelerates exactly when it should be holding steady or increasing.
How do credit card issuers actually calculate the minimum payment?
Most set it as a small percentage of the statement balance — often in the low single digits — with a minimum dollar floor so very small balances don't produce a near-zero payment. That's the same structure modeled here.
Why do card statements show a 'minimum payment warning' box?
Card issuers are required to disclose how long minimum-only payments would take to clear the balance and how much interest that would cost, precisely because the real cost is so much higher than it feels — this calculator produces the same kind of estimate.
What's the difference between this and the credit card payoff calculator?
This one models minimum-only payments, which change every month as the balance shrinks. The payoff calculator instead works from a fixed payment amount you choose, showing how much faster and cheaper a steady, committed payment gets you to zero.
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